Leisure man is most like a man when he is at leisure. In the 18th century, English Defoe, famous for the book Robinson Crusoe, actually he began to write novels at the age of nearly 60. In the previous decades, he wrote almost all the prose as a news reporter. One of the earliest books, An Essay upon Projects, published in 1697, is a curious and interesting book, the contents of which I will not introduce now, except to quote from it: "Man is the worst creature God has ever created for living...